diff --git a/Dockerfile b/Dockerfile
index ef5455d..e48fc23 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -259,7 +259,7 @@ RUN for i in 1 2 3 4 5; do \
       && go install honnef.co/go/tools/cmd/staticcheck@latest \
       && break || { echo "go install attempt $i failed, sleeping $((i*10))s"; sleep $((i*10)); }; \
     done; \
-    command -v govulncheck && command -v staticcheck || { echo "go install failed after 5 attempts"; exit 1; }
+    test -x "$GOPATH/bin/govulncheck" && test -x "$GOPATH/bin/staticcheck" || { echo "go install failed after 5 attempts"; exit 1; }
 
 # GOPATH already set above; PATH handled by the final clean ENV at the
 # bottom (which includes /home/crafter/go/bin). No per-layer PATH ENV